1 //===-- DIERef.cpp --------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "DIERef.h" 10 #include "lldb/Utility/DataEncoder.h" 11 #include "lldb/Utility/DataExtractor.h" 12 #include "llvm/Support/Format.h" 13 #include <optional> 14 15 using namespace lldb; 16 using namespace lldb_private; 17 18 void llvm::format_provider<DIERef>::format(const DIERef &ref, raw_ostream &OS, 19 StringRef Style) { 20 if (ref.file_index()) 21 OS << format_hex_no_prefix(*ref.file_index(), 8) << "/"; 22 OS << (ref.section() == DIERef::DebugInfo ? "INFO" : "TYPE"); 23 OS << "/" << format_hex_no_prefix(ref.die_offset(), 8); 24 } 25 26 std::optional<DIERef> DIERef::Decode(const DataExtractor &data, 27 lldb::offset_t *offset_ptr) { 28 DIERef die_ref(data.GetU64(offset_ptr)); 29 30 // DIE offsets can't be zero and if we fail to decode something from data, 31 // it will return 0 32 if (!die_ref.die_offset()) 33 return std::nullopt; 34 35 return die_ref; 36 } 37 38 void DIERef::Encode(DataEncoder &encoder) const { encoder.AppendU64(get_id()); } 39